If you have not built this yet be carefull, the error voltage correction can be as high as 1.5% on adjustable or fixed regulators even with load shareing resistors that difference will cycle the regulators to full current then thermal shutdown and then repeat the cycle one after another, you will never see any current gain.
Try useing an adjustable with an op amp comparator to sync the regs.

An op amp comparator? I know that the regulators must be synced up, but on the national website, they said it was okay to put regulators in parallel as long as you put a very low ohm resistor on the output of each of the regulators. Is that enough to say this is a good idea; or is it a big...... ?

About a week ago, i "cooked up" a pair of high-current adjustable v-regs, using 5 paralelled LM317's and 5 LM337's, on separate pcb's, with summing resistors on each chip's output. I can attach the pcb's if anyone's interested...